Path: utzoo!attcan!uunet!tektronix!tekcrl!tekgvs!toma
From: toma@tekgvs.GVS.TEK.COM (Tom Almy)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Underlining on EGA monitors
Message-ID: <4418@tekgvs.GVS.TEK.COM>
Date: 22 Dec 88 18:10:06 GMT
References: <1457@aucs.UUCP>
Reply-To: toma@tekgvs.GVS.TEK.COM (Tom Almy)
Organization: Tektronix, Inc., Beaverton,  OR.
Lines: 22

In article <1457@aucs.UUCP> 831059l@aucs.UUCP (Langlois) writes:
>
>	I've been trying to get underlining to work on an EGA monitor but
>I have had only limited success. I[...]
>WordPerfect 5.0 allows
>underlining on different backgrounds. I wonder how they do it.

You can run the EGA in a 512 character mode, where 256 characters are
underlined versions of the other 256 characters.  The fonts are stored
in video RAM.  One of the bits in each character position's attribute
byte is used to indicate which set of 256 characters to use.  After
loading the fonts palette you get 8 foreground colors, 8/16 background
colors (depending on blink-enable bit), and underline enable.

An excellent book on all aspects of the EGA (as well as VGA, MDA, CGA,
and various Hercules cards) is "Programmer's Guide to PC & PS/2 Video
Systems", by Richard Wilton, Microsoft Press, 1987.  Don't program the
display controller without it!

Tom Almy
toma@tekgvs.TEK.COM
Standard Disclaimers Apply